UG-293
AD9643/AD9613/AD6649/AD6643 User Guide
Rev. A | Page 12 of 26
4.
If operating the
AD6649
in the mode using the 95 MHz
FIR filter and fixed-frequency NCO, the amplitude
displayed is −2.5 dBFS for a −1.0 dBFS input signal (see
Figure 18) to the desired settings. If operating the
AD6649
in the mode utilizing the 100 MHz FIR filter and tunable-
frequency NCO, the amplitude displayed is −1.3 dBFS for a
−1.0 dBFS input signal (see Figure 19).
09940-
018
Figure 18. Visual Graph Window of VisualAnalog (
AD6649
)—95 MHz FIR
Filter and Fixed-Frequency NCO Mode
09
9
4
0-
01
9
Figure 19. Visual Graph Window of VisualAnalog (
AD6649
)—100 MHz FIR
Filter and Tunable-Frequency NCO Mode
5.
Repeat Step 3 to save the graph in a .csv file format.
6.
If operating the
AD6643
with NSR enabled, certain options
in VisualAnalog must be enabled. Click the button circled
in the
FFT Analysis
box (see Figure 20) in VisualAnalog to
bring up the options for setting the NSR.
09
94
0-
0
20
Figure 20. VisualAnalog, Main Window—Showing FFT Analysis for
AD6643
